So there's been some debate on Metarushes and Megafobbing recently. I had planned to respond but realized my grievances are probably unrelated enough to warrant a separate thread. So here goes.
I think CM has a big problem with map design. Mainly, the maps are way too linear. This encourages metarushing and makes games kind of stale.
Let's take LV-624 as an example. Marines will always FOB at Hydro, because they know that the Xeno hive is at the Caves on the other side of the fogwall. They will do this round after round of LV because it's completely unreasonable to tell your squads to FOB at some random place if you know, OOCly, that the Xenos are hived at the Caves to the North.
It completely takes away any element of reconnaissance, since the Xenos always spawn in one fixed place and Queens are generally very hesistant to move the hive somewhere else, and also because there's not very many good places to move the hive.
I think the simple solution (not necessarily the easiest) is to expand the maps and randomize Xeno spawns. Using LV again, add an East caves (east of Secure Storage perhaps) and South caves (south of engineering) and let the hive start the round in there. This stops metarushes and also makes rounds less stale, since Marines will have to scout out where Xenos are now and build mini-FOB's on the fly.